Duplicate content issue: hreflangs & canonicals

[seo.gops]

Hey guys,

I have an issue with duplicate content being flagged on my site by ahrefs and other SEO crawlers.

The site is set up so with hreflang for 3 different languages like so:

https://examplesite.com/en/page
https://examplesite.com/es/page
https://examplesite.com/pt/page
When a user land on https://examplesite.com they are automatically redirected to the appropriate language based on their browser/ip.

However, I'm getting duplicate content flagged up between

https://examplesite.com/page
and

https://examplesite.com/en/page
Can anyone offer a solution? Should I be applying canonical tags as well as href lang? If so where?

Thanks in advance!